Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2397
Number of amino acids:29
Molecular Weight:3297.88 Da
Theoretical pI:4.83


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.45%
Cysteine CYS (C)620.69%
Glutamic Acid GLU (E)26.9%
Aspartic Acid ASP (D)310.34%
Glycine GLY (G)26.9%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)310.34%
Histidine HIS (H)13.45%
Lysine LYS (K)13.45%
Methionine MET (M)13.45%
Leucine LEU (L)26.9%
Asparagine ASN (N)00%
Glutamine GLN (Q)13.45%
Proline PRO (P)13.45%
Serine SER (S)13.45%
Arginine ARG (R)26.9%
Threonine THR (T)00%
Tryptophan TRP (W)13.45%
Valine VAL (V)13.45%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC135
HydrogenH218
NitrogenN40
OxygenO42
SulphurS7

FormulaC135H218N40O42S7
Total Number of Atoms:442


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):5
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    5875
Absorption 0.1% (=1 g/l)    1.781,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5500
Absorption 0.1% (=1 g/l)    1.668,   assuming all CYS residues are reduced
Aromaticity:0.034

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 53.76

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.14, 13.79, 20.69]

Amino acids in helix: V, I, Y, F, W, L || Amino acids in turn: N, P, G, S || Amino acids in sheet: E, M, A, L
Aliphatic index:80.6896
Grand average of hydropathicity (GRAVY):0.10